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The system CaO-SiO2-MgO-H2O is related with the stable mechanism of high-magnesium Portland cements by active silica materials under autoclave conditions. The stable mechanisms dealing with the system CaO-SiO2-MgO-H2O were mainly considered to the formation of tobermorite or hydrous magnesium silicate and to the incorporation of MgO in the tobermorite lattice. Mixtures of different MgO/CaO and CaO/SiO2 were treated hydrothermally at 180 to 300 deg C saturated water vapor pressures for 10 h to 3 days. The results show that tobermorite coexists with Mg(OH)2 and xonotlite phases at 180 deg C, that xonotlite phase is coexistent with hydrous magnesium silicate when Mg(OH)2 disappears at over 240 deg C. MgO can enter 14.71 weight-% into xonotlite phase, more than in tobermorite phase. At the same time, the variation of lattice parameters in Mg-xonotlite phase is extremely small.
The system CaO-SiO2-MgO-H2O is related with the stable mechanism of high-magnesium Portland cements by active silica materials under autoclave conditions. The stable mechanisms dealing with the system CaO-SiO2-MgO-H2O were mainly considered to the formation of tobermorite or hydrous magnesium silicate and to the incorporation of MgO in the tobermorite lattice. Mixtures of different MgO/CaO and CaO/SiO2 were treated hydrothermally at 180 to 300 deg C saturated water vapor pressures for 10 h to 3 days. The results show that tobermorite coexists with Mg(OH)2 and xonotlite phases at 180 deg C, that xonotlite phase is coexistent with hydrous magnesium silicate when Mg(OH)2 disappears at over 240 deg C. MgO can enter 14.71 weight-% into xonotlite phase, more than in tobermorite phase. At the same time, the variation of lattice parameters in Mg-xonotlite phase is extremely small.
Mg-xonolite and its coexisting phases
Mg-Xonotlit und seine koexistierenden Phasen
Cement and Concrete Research ; 27 ; 315-320
1997
6 Seiten, 3 Bilder, 4 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
Mg-Xonotlite and its Coexisting Phases
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